Wristwatch



FIG. 1 is a front elevation of a wristwatch showing my new design;

FIG. 2 is a front and right side perspective view thereof;

FIG. 3 is a right side elevation thereof; and,

FIG. 4 is a left side elevation thereof.

The broken lines showing the crown in FIGS. 1, 2 and 3 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a wristwatch, as shown and described. 